Hair iron



FIG. 1 is a left-side perspective view of a hair iron in an open position.

FIG. 2 is a left side view thereof.

FIG. 3 is a right side view thereof.

FIG. 4 is a top view thereof; and,

FIG. 5 is a bottom view thereof.

The broken lines are for the purpose of illustrating the environment of the design only and form no part of the claimed design. 

CLAIM The ornamental design for a hair iron, as shown and described. 